Which of the following uses ultrasound to measure the direction and speed of blood as it flows through blood vessels?

Name: Which of the following uses ultrasound to measure the direction and speed of blood as it flows through blood vessels?
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Doppler ultrasound uses sound waves to measure the direction and speed of blood flow in blood vessels. DEXA scan is used to measure bone density, PET scan measures metabolic activity in tissues, and electrocardiography measures electrical activity in the heart.

Which of the Following Uses Ultrasound to Measure the Direction